Today the free Amazon App Store, downloaded so. Why does the app decorated with "HD" in the name does not open up to me. A standard battery indicator and any other information / statistics are displayed in white letters on a dark background average. Innteressant are the details remaining battery consumption in various activities ("how long my battery lasts even if I now only the phone / Games / Surf the Internet etc") All in all though not a bad app, but can not be more than a few free apps in the area. BUY I would not. Many other "battery apps" make a proposals to achieve a longer duration, which can not have this.